248 Zeilen
8 KiB
PHP
248 Zeilen
8 KiB
PHP
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<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Locale
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* @copyright Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id$
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*/
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/**
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* Utility class for proxying math function to bcmath functions, if present,
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* otherwise to PHP builtin math operators, with limited detection of overflow conditions.
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* Sampling of PHP environments and platforms suggests that at least 80% to 90% support bcmath.
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* This file should only be loaded for the 10% to 20% lacking access to the bcmath extension.
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*
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* @category Zend
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* @package Zend_Locale
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* @copyright Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Locale_Math_PhpMath extends Zend_Locale_Math
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{
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public static function disable()
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{
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self::$_bcmathDisabled = true;
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self::$add = array('Zend_Locale_Math_PhpMath', 'Add');
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self::$sub = array('Zend_Locale_Math_PhpMath', 'Sub');
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self::$pow = array('Zend_Locale_Math_PhpMath', 'Pow');
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self::$mul = array('Zend_Locale_Math_PhpMath', 'Mul');
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self::$div = array('Zend_Locale_Math_PhpMath', 'Div');
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self::$comp = array('Zend_Locale_Math_PhpMath', 'Comp');
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self::$sqrt = array('Zend_Locale_Math_PhpMath', 'Sqrt');
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self::$mod = array('Zend_Locale_Math_PhpMath', 'Mod');
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self::$scale = array('Zend_Locale_Math_PhpMath', 'Scale');
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self::$defaultScale = 0;
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self::$defaultPrecision = 1;
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}
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public static $defaultScale;
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public static $defaultPrecision;
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public static function Add($op1, $op2, $scale = null)
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{
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if ($scale === null) {
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$scale = Zend_Locale_Math_PhpMath::$defaultScale;
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$precision = Zend_Locale_Math_PhpMath::$defaultPrecision;
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} else {
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$precision = pow(10, -$scale);
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}
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if (empty($op1)) {
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$op1 = 0;
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}
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$op1 = self::normalize($op1);
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$op2 = self::normalize($op2);
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$result = $op1 + $op2;
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if (is_infinite($result) or (abs($result - $op2 - $op1) > $precision)) {
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require_once 'Zend/Locale/Math/Exception.php';
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throw new Zend_Locale_Math_Exception("addition overflow: $op1 + $op2 != $result", $op1, $op2, $result);
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}
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return self::round(self::normalize($result), $scale);
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}
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public static function Sub($op1, $op2, $scale = null)
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{
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if ($scale === null) {
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$scale = Zend_Locale_Math_PhpMath::$defaultScale;
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$precision = Zend_Locale_Math_PhpMath::$defaultPrecision;
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} else {
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$precision = pow(10, -$scale);
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}
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if (empty($op1)) {
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$op1 = 0;
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}
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$op1 = self::normalize($op1);
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$op2 = self::normalize($op2);
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$result = $op1 - $op2;
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if (is_infinite($result) or (abs($result + $op2 - $op1) > $precision)) {
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require_once 'Zend/Locale/Math/Exception.php';
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throw new Zend_Locale_Math_Exception("subtraction overflow: $op1 - $op2 != $result", $op1, $op2, $result);
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}
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return self::round(self::normalize($result), $scale);
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}
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public static function Pow($op1, $op2, $scale = null)
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{
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if ($scale === null) {
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$scale = Zend_Locale_Math_PhpMath::$defaultScale;
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}
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$op1 = self::normalize($op1);
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$op2 = self::normalize($op2);
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// BCMath extension doesn't use decimal part of the power
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// Provide the same behavior
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$op2 = ($op2 > 0) ? floor($op2) : ceil($op2);
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$result = pow($op1, $op2);
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if (is_infinite($result) or is_nan($result)) {
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require_once 'Zend/Locale/Math/Exception.php';
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throw new Zend_Locale_Math_Exception("power overflow: $op1 ^ $op2", $op1, $op2, $result);
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}
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return self::round(self::normalize($result), $scale);
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}
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public static function Mul($op1, $op2, $scale = null)
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{
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if ($scale === null) {
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$scale = Zend_Locale_Math_PhpMath::$defaultScale;
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}
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if (empty($op1)) {
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$op1 = 0;
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}
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$op1 = self::normalize($op1);
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$op2 = self::normalize($op2);
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$result = $op1 * $op2;
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if (is_infinite($result) or is_nan($result)) {
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require_once 'Zend/Locale/Math/Exception.php';
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throw new Zend_Locale_Math_Exception("multiplication overflow: $op1 * $op2 != $result", $op1, $op2, $result);
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}
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return self::round(self::normalize($result), $scale);
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}
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public static function Div($op1, $op2, $scale = null)
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{
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if ($scale === null) {
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$scale = Zend_Locale_Math_PhpMath::$defaultScale;
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}
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if (empty($op2)) {
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require_once 'Zend/Locale/Math/Exception.php';
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throw new Zend_Locale_Math_Exception("can not divide by zero", $op1, $op2, null);
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}
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if (empty($op1)) {
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$op1 = 0;
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}
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$op1 = self::normalize($op1);
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$op2 = self::normalize($op2);
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$result = $op1 / $op2;
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if (is_infinite($result) or is_nan($result)) {
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require_once 'Zend/Locale/Math/Exception.php';
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throw new Zend_Locale_Math_Exception("division overflow: $op1 / $op2 != $result", $op1, $op2, $result);
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}
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return self::round(self::normalize($result), $scale);
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}
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public static function Sqrt($op1, $scale = null)
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{
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if ($scale === null) {
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$scale = Zend_Locale_Math_PhpMath::$defaultScale;
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}
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if (empty($op1)) {
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$op1 = 0;
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}
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$op1 = self::normalize($op1);
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$result = sqrt($op1);
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if (is_nan($result)) {
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return NULL;
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}
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return self::round(self::normalize($result), $scale);
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}
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public static function Mod($op1, $op2)
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{
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if (empty($op1)) {
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$op1 = 0;
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}
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if (empty($op2)) {
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return NULL;
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}
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$op1 = self::normalize($op1);
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$op2 = self::normalize($op2);
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if ((int)$op2 == 0) {
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return NULL;
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}
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$result = $op1 % $op2;
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if (is_nan($result) or (($op1 - $result) % $op2 != 0)) {
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require_once 'Zend/Locale/Math/Exception.php';
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throw new Zend_Locale_Math_Exception("modulus calculation error: $op1 % $op2 != $result", $op1, $op2, $result);
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}
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return self::normalize($result);
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}
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public static function Comp($op1, $op2, $scale = null)
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{
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if ($scale === null) {
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$scale = Zend_Locale_Math_PhpMath::$defaultScale;
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}
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if (empty($op1)) {
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$op1 = 0;
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}
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$op1 = self::normalize($op1);
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$op2 = self::normalize($op2);
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if ($scale <> 0) {
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$op1 = self::round($op1, $scale);
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$op2 = self::round($op2, $scale);
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} else {
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$op1 = ($op1 > 0) ? floor($op1) : ceil($op1);
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$op2 = ($op2 > 0) ? floor($op2) : ceil($op2);
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}
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if ($op1 > $op2) {
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return 1;
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} else if ($op1 < $op2) {
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return -1;
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}
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return 0;
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}
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public static function Scale($scale)
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{
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if ($scale > 9) {
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require_once 'Zend/Locale/Math/Exception.php';
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throw new Zend_Locale_Math_Exception("can not scale to precision $scale", $scale, null, null);
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}
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self::$defaultScale = $scale;
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self::$defaultPrecision = pow(10, -$scale);
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return true;
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}
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}
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Zend_Locale_Math_PhpMath::disable(); // disable use of bcmath functions
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